Mark, Owen and Curry collected erasers in the ratio of 9 : 7 : 7. After Curry gave
710 to Mark and Owen, Curry had 104 less erasers than Mark. The number of erasers that Owen had increased by 20%. How many erasers did Mark and Curry have in the end?
| |
Mark |
Owen |
Curry |
| Before |
9 u |
7 u |
7 u |
| Change |
+ 3.5 u |
+ 1.4 u |
- 4.9 u |
| After |
12.5 u |
8.4 u |
2.1 u |
Number of erasers that Curry gave to Mark and Owen
=
710 x 7 u
= 4.9 u
Number of erasers that Owen received from Curry
=
20100 x 7 u
= 1.4 u
Number of erasers that Mark received from Curry
= 4.9 u - 1.4 u
= 3.5 u
Number of less erasers that Curry had less than Mark
= 12.5 u - 2.1 u
= 10.4 u
10.4 u = 104
1 u = 104 ÷ 10.4 = 10
Number of erasers that Mark and Curry had
= 12.5 u + 2.1 u
= 14.6 u
= 14.6 x 10
= 146
Answer(s): 146
